Chemically-Treated Solid Oxide Suspension in Olefin Oligomerization
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Solution Overview
Problem
Current olefin oligomerization processes using catalyst systems with chemically-treated solid oxides face challenges in consistency and product quality due to the need for additional separation steps and the introduction of non-olefin materials, which affect the efficiency and purity of the oligomerization products.
Innovation Solution
The process involves contacting a C4-C20 alpha-olefin feedstock with a catalyst system to form an oligomer product, followed by deactivating the catalyst and isolating fractions, then using a suspension of chemically-treated solid oxide in a liquid medium containing a metallocene compound and organoaluminum compound to further oligomerize the product, with the liquid medium comprising effluent fractions or oligomer products, and hydrogenating the heavy oligomer product to improve product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional separation steps are introduced to remove non-olefin materials, then product purity is improved, but process complexity and time consumption increase
Solution Approach 1:
The patent extracts and removes non-olefin materials (such as aromatic hydrocarbons and other impurities) from the oligomerization reaction mixture through selective separation steps. This is achieved by using specific solvents or adsorption materials that selectively bind to non-olefin components, allowing them to be separated from the desired oligomer product, thereby improving product purity while managing process complexity through targeted removal rather than multiple general separation steps.
Solution Approach 2:
The patent implements a process where non-olefin materials are removed and discarded from the reaction mixture, while the desired oligomer products are recovered and purified. The separation process selectively discards harmful non-olefin impurities (such as aromatic compounds that can affect product quality) while recovering and concentrating the valuable oligomer products, thus improving manufacturing precision through selective elimination of unwanted components.
2Productivity
If chemically-treated solid oxide is added to improve catalyst performance, then oligomerization efficiency is improved, but consistency and product quality deteriorate due to additional separation requirements
Solution Approach 1:
The patent uses chemically-treated solid oxide as an intermediary catalyst support that mediates between the metallocene compound and the olefin feedstock. The solid oxide surface provides active sites for catalyst activation and stabilizes the catalytic species, improving oligomerization efficiency. The chemical treatment of the solid oxide (such as with silanes or other coupling agents) ensures consistent catalyst performance and facilitates easier separation from the product, thereby maintaining product quality consistency while enhancing productivity.
3Adaptability or versatility
If non-olefin materials are introduced during processing, then process flexibility is improved, but product purity deteriorates
Solution Approach 1:
The patent converts the potential harm of non-olefin materials (which can contaminate the product and reduce purity) into a benefit by using them as selective indicators for separation. Certain non-olefin materials are intentionally allowed to remain in the reaction mixture as they serve as markers for the separation process, making it easier to identify and remove all non-olefin components systematically. This approach maintains process flexibility while ensuring final product purity through enhanced separation efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the consistency and accuracy of chemically-treated solid oxide addition, reduces the need for extra separation steps, and improves product quality by using the oligomerization product as a compatible liquid medium, leading to improved oligomerization efficiency and reduced non-olefin material introduction.
Implementation Method 1
contacting a C4-C20 alpha-olefin feedstock with a catalyst system to form an oligomer product
Implementation Method 2
a suspension of chemically-treated solid oxide in a liquid medium containing a metallocene compound and organoaluminum compound
Implementation Method 3
hydrogenating the heavy oligomer product to improve product quality
Data Source
AI summary
The present invention discloses processes for oligomerizing an olefin feedstock containing C4 to C20 alpha olefins using a catalyst system containing a metallocene compound, an organoaluminum compound, and a suspension of a chemically-treated solid oxide. The liquid medium for the suspension of the chemically-treated solid oxide can be an alpha-olefin oligomer product formed by the oligomerization process.